Generator of electric current



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' June 30, 1925 1,544,010 E. JORDAN I]; v I v GENERATOR 0F ELECTRICCURRENT I 3}" Filed April 24. 1923 V .J

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I A l INVENTOR r BY ATTORNEY Patented June 36, 1925.

1,544,010 NT-IPFFIC EUGENE JORDAN, OI" PARIS, FRANCE, ASSIGNOR TOSOCIETE LAIR LIQUIDE (SOCIETE DESJEBDCECDES GEORGES CLAUDE),

- Application filed April 24;, 1923.. Serial No. 634,205.

To all whomit maycamem:

Be it known that I,.-EUeizNnonnAN, a citi- -zen of the Republic ofFrance, :residingat Paris, France, have .invented certain new 6 anduseful Improvemen'tsin Generators of Electric Current; and I .do herebydeclare the followingto be a full,-clear, and exact description of'theinvention-such as will enable others skilled in the art to which it 10appertains to make and nsethe same.

- ,l'wThis' invention relates to generators of electric current andparticularly rto a -reci1')- rec'ating engine in which current fisgener- F-ated directly by "the reciprocationfief a mOVv.

ing piston actuated bythe aexpansion 19,

ufluid. I .r :q

:The inventionis particularly us I ngthe .expansionof gases withexternal workas-in liquefaction systems,;although it is not,

ited to such use. In liquefaction systems wherein refrigeration isdeveloped by expansion of gases in engines, it has been usual to employreciprocating engines connected to rotary current generators whichsupply .25 the load and cause the expanding gas to do work. Thisarrangement involves a coinplication of apparatus and losses incidentalto the multiplicity of moving parts.

It is the object of the present invention to avoid the disadvantages ofapparatus heretofore used and to provide a 'simple and selfcontainedgenerator in which the load is applied directl to the moving piston.

Further o jects and advantages of the invention will be apparent asit isbetter understood by reference to the following speci- ---fication andaccompanyingdra g which illustrates diagrammatlcally; a form ofexpension engine which is adapted to accom- 40 plish the desired result.7

In the application of the invention an expansion cylinder is employedwith .suitable inlets and outlets forthe gas which may be controlled byvalves which permit adjust- 4 ment of the cut-ofl. The cylinder andvalve mechanism may be such as are employed on ordinary expansionengines. The details of the valve mechanism orm no part of the presentinvention and can be supplied 30 readily by anyone who is familiar withthe structure and operation of expansion engines. The engine hereinafterdescribed difi'ers from others in that the piston is not connectedextern y of the engine and i Qiinerely floats in the cylinder, beingmoved :to and fro by the expansion of the gas as it is admitted andexhausted under control of the valve mechanism. The inner wall of thepiston, which is hollow, consists of soft -irongin which a flux is setup under the excitation ,of an electric current. The piston is;therefore an armature. A stationary .plunger is supported at one end onthe cylinderihead and projects into the hollow piston. plunger h as anon-magnetic core and a suracelayer ofsoft'iron. it also carries the*field windingsi whereby the flux is set up in f; the armature and thewindings in which ouris generated-as the piston or armatureLinpves'grelatiyeflyj tothe plunger. Suitable f-currentlleadsareprov'ided to supply the exciting-current andto deliver the currentgenerated-by the engine.

The-.:excitin g current may be obtained froiii' any suitable source suchas line, storage batteries, etc., or even through a current rectifiershunted across the circuit in which current i's induced by the operationof the engine. The current induced is alternating with a .period whichis a function of the number of poles and-the velocity of pistondisplacement. current may be utilized, or it may be caused to passthrough a suit- --ablere'sistance where the only purpose is to provide.a loadg for the engine.

Referring td'ithe drawing, A indicates the expansion engine which may beof usual construction, having passages X through which the gas isadmitted and exhausted under control of the valves (not shown). A pistonH is adapted to move to and fro in the cylinder. The piston has acoaxial recess extending substantially throughout its length, and in therecess lamellae B of soft iron are supported, the inner surface of thepiston being thus provided with notches and annular poles. These polesproject radially into the central space of the piston.

A plunger P is securely mounted on the headof the cylinder andsubstantially fills the central space in the piston when the latter isat one end of its stroke. The

' plunger consists of .a non-magnetic core C upon which soft ironlamellae D are mounted, the lamellae forming notches and polescorresponding to those on the interior surface of the piston.

An insulated conductor E, of copper, for

example, is *WOllIld in thmgreeves; the -direction ofwimlingalternatesliinthe adjacent grooves so as to produce consecutivepoles of oppositesign when, the conductor is ener- Alternating currentin the conductor: F formmg the router coils ot the plunger, and thiscurrent may be utilized as desired. By the application of the inventionthe difficulties met. in maintaining the operating parts =0f :enginesand rotary generators, particularly when these are relatively sin-alhisavoided --'by' the elimination of the major portion of 'rhe apparatusheretofore considered to be necessary in such installations. The efii--ciency of the apparatus .isxgaeatly increased becauselosses'fromidriction are reduced to a min mum.

Marous changes mayhermade in the form and. details Eiofaarrlmgement: ofthe parts without departing from the invention or sacrificing theadyantages.

1. *A reciprocatingiffluid pressure generator of electric current, whichcomprises a cylinder, ,a piston adapted to reciprocate therein, andfixed means Within the piston ifor; generating induced currents by thedisplacement of the piston.

2. A reciprocating-fluid pressure generator of electric current, whichcomprises a "cylinder, a espiston adapted to reciprocate -therein,aa nda pilunger supponted by the cylinderiasnd-aidaptedwto be enclosed bythepiston, :smid-iplunger being provided with i-meansn-for generatimginduced currents by ithe displacement efthe piston.

A reciprocating fluidpressure generator of electric eurrenhnvhichcomprises .a cylinder, a piston adapted 1 to reciprocate therein"and-provided with an axial recess havingsoitriron segments on itsperiphery and a plunger secured to the cylinder head Rand protrudinginto the recess, said plunger carrying soft iron segments and inductorand induced ourrentcoilsonsits periphery.

. :Iarstestimony whereof I affix my signature.

gnUeEnEJoRDAN.

